Method of manufacturing ophthalmic lenses and system for the manufacturing of such ophthalmic lenses

ABSTRACT

The invention concerns a method of manufacturing an ophthalmic lens, comprising the steps of providing, mounting and blocking a substrate ( 10 ) on a machining support unit ( 65 ), surfacing an upper face ( 12 ) of said substrate, edging a peripheral edge ( 13 ) of said substrate, wherein said machining support unit comprises a surfacing member ( 40 ) and an edging member ( 30 ) which are separable, said surfacing member having a cavity ( 51 ) in which said edging member is located during said step of surfacing, said surfacing and edging members being configured so that said substrate is mounted and blocked on said machining support unit in a first predetermined position for the surfacing and the edging and, between said steps of surfacing and edging, the method comprises the step of withdrawing said surfacing member from said machining support unit by retaining said substrate on said edging member.

FIELD OF THE INVENTION

The invention relates to the manufacturing of a lens such as anophthalmic lens, and a system for the manufacturing of such anophthalmic lens.

BACKGROUND ART

It is well known that lenses, and in particular spectacle lenses,comprise an ophthalmic substrate having geometrical features adapted tothe wearer.

Some coatings can be added on the ophthalmic substrate to obtain afinished ophthalmic lens. The coatings are for instance an anti-abrasivecoating to increase the abrasion resistance of the lens, and/or ananti-reflective coating to decrease the reflection of light and/or ananti-soiling coating applied over the anti-reflective coating.

One known method to manufacture an ophthalmic substrate is described inEuropean patent application EP 2 093 018, in which a single blockingpiece is provided for surfacing and edging the ophthalmic substrate.

The blocking piece is made from a plastic material moulded in a singlepiece and is configured to receive an optical substrate, also namedblank.

The blocking piece has a reception zone of the blank which is delimitedby a peripheral outline and which has a diameter similar to the diameterof the blank.

The blank is mounted and fixed to the blocking piece, a first face ofthe blank facing a mounting face of the blocking piece.

The system formed by the blank and the blocking piece is then mounted ona surfacing machine for the surfacing of a second face of the blank, thesecond face being opposite to the first face.

Next, a step of surfacing of the second face of the blank is carriedout.

The system formed by the blocking piece and the blank whose second faceis machined is then transferred to an edging machine (for instance agrinder) for the edging of a peripheral edge of the blank, which edgelinks the first and second faces of the blank.

Next, a step of edging of the edge of the blank is carried out. During,the step of edging, the outline of the single blocking piece is furthermachined.

A substantial portion of the single blocking piece is removed becausethe step of edging generally machines the blank from a maximum firstdiameter, for instance equal to around 70 mm, to a maximum seconddiameter smaller than the first diameter, for instance 30 mm. The secondface and the outline of the blank are thus machined in order to form theophthalmic lens (or at least the ophthalmic substrate) which is cut andhas a shape similar to a shape of the spectacle frame on which theophthalmic lens is configured to be mounted.

The single blocking piece made from plastic material is thus here adisposable blocking piece.

The invention is directed to a method of manufacturing an ophthalmiclens, comprising a step of surfacing and a step of edging, the methodbeing simple, convenient and economical to carry out.

SUMMARY OF THE INVENTION

The invention accordingly provides a method of manufacturing anophthalmic lens having a first face, a second face opposite to saidfirst face and a peripheral outline linking said first and second faces,the method comprising the following steps:

-   -   providing a substrate having a lower face, an upper face        opposite to said lower face and a peripheral edge linking said        lower and upper faces;    -   providing a machining support unit configured to receive said        substrate;    -   mounting said substrate on said machining support unit and        blocking said substrate with said machining support unit, said        lower face of said substrate facing a mounting face of said        machining support unit;    -   surfacing said upper face of said substrate;    -   edging said peripheral edge of said substrate;

wherein said machining support unit comprises a surfacing member and anedging member separable from said surfacing member, said surfacingmember having a cavity defining an internal space in which said edgingmember is located during said step of surfacing, said surfacing memberand edging member being configured so that said substrate is mounted andblocked on said machining support unit in a first predetermined positionfor the surfacing of said upper face and for the edging of saidperipheral edge, and, between said steps of surfacing and edging, themethod further comprises the step of withdrawing said surfacing memberfrom said machining support unit by retaining said substrate on saidedging member.

Thanks to the method according to the invention, the substrate is onlyonce positioned, is blocked for the step of surfacing and is notunblocked for the step of edging. This is the removal of the surfacingmember which allows the step of edging to be carried out.

The positioning of the substrate in the first predetermined position onthe machining support unit, in other words relative to the surfacingmember and relative to the edging member, is even retained after thestep of surfacing so that the step of edging can be directly carriedout. The positioning reference is thus not lost between surfacing andedging, by virtue of which the method according to the invention allowsto improve the quality of the ophthalmic lens.

Contrarily to the disposable blocking piece of the state of the artdescribed above, the machining support unit used in the method accordingto the invention is reusable.

The method of manufacturing according to the invention is thus precise,simple, convenient and economical to carry out.

According to features preferred as being very simple, convenient andeconomical for embodying the method according to the invention:

-   -   it further comprises between said steps of surfacing and edging,        a step of polishing said upper face surfaced;    -   it further comprises a step of coating said upper face and/or        said lower face of said substrate, for instance with an        anti-reflective coating, a photochromic coating, a polarizing        coating, a top-coat or a hard coat, between or after said steps        of surfacing and edging;    -   said substrate is fixed to said mounting face of said machining        support unit by the intermediary of a fastening member; and/or    -   said substrate comprises a first reference point of said upper        face corresponding to a rotation center of a said substrate        relative to a first machining referential of a surfacing        machine, said substrate further comprises a second reference        point corresponding to an optical center and/or a boxing center        of said substrate relative to a geometrical shape of said        ophthalmic lens and to a second machining referential of an        edging machine, and said first predetermined position is defined        by an alignment of said first reference point of said substrate        with a first geometrical center of said surfacing member and an        alignment of said second reference point of said substrate with        a second geometrical center of said edging member.

The invention further provides a system for the manufacturing of anophthalmic lens having a first face, a second face opposite to saidfirst face and a peripheral outline linking said first and second faces,said system comprising:

-   -   a substrate having a lower face, an upper face opposite to said        lower face and a peripheral edge linking said lower and upper        faces;    -   a machining support unit comprising a mounting face configured        to receive said substrate for surfacing of said upper face of        said substrate and further for edging of said peripheral edge of        said substrate;

wherein said machining support unit comprises a surfacing member and anedging member separable from said surfacing member, said surfacingmember has a cavity defining an internal space in which said edgingmember is configured to be located during said surfacing of said upperface, said surfacing member and edging member are configured so thatsaid substrate is mounted and blocked on said machining support unit ina first predetermined position for said surfacing of said upper face andfor said edging of said peripheral edge, and said surfacing member andedging member are further configured so that said surfacing member isable to be withdrawn from said machining support unit by retaining saidsubstrate on said edging member for said edging of said peripheral edge.

Thanks to the removability of the surfacing member from the machiningsupport unit, the system according to the invention is thus configuredso that the substrate is only once positioned, is blocked for a step ofsurfacing and is not unblocked for a step of edging. Only the surfacingmember has to be removed from the machining support unit to directlycarry out the step of edging.

The positioning of the substrate in the first predetermined position onthe machining support unit, in other words relative to the surfacingmember and relative to the edging member, is retained even after theremoval of the surfacing member from the machining support unit. Thepositioning reference is thus not lost between surfacing and edging, byvirtue of which the method according to the invention allows to improvethe quality of the ophthalmic lens.

Contrarily to the disposable blocking piece of the state of the artdescribed above, the machining support unit of the system according tothe invention is reusable.

The system according to the invention is thus precise, simple,convenient and economic.

According to features preferred as being very simple, convenient andeconomical for embodying the system according to the invention:

-   -   said mounting face is formed by an internal face of said        surfacing member and an upper face of said edging member;    -   said internal face of said surfacing member and said upper face        of said edging member are configured to form a first shape which        matches with a second shape of said lower face of said        substrate;    -   said surfacing member is formed by a ring comprising a body        having a generally cylindrical shape, said body having said        cavity and comprising an internal lateral face and an internal        bottom face formed in said cavity which defines said internal        face;    -   said body further comprises a recess formed in said internal        bottom face, said recess forming a housing configured to receive        said edging member;    -   said body further comprises a base configured to be mounted on a        surfacing machine and on an edging machine;    -   said edging member is formed by a pin which is accommodated into        said cavity of said surfacing member;    -   it further comprises a fastening member located at least        partially on said mounting face and sandwiched between said        machining support unit and said lower face of said substrate;    -   said fastening member has a diameter at least equal or greater        than a diameter of an upper face of said edging member; and/or    -   said fastening member is formed by an adhesive film.

BRIEF DESCRIPTION OF THE DRAWINGS

The description of the invention now continues with a detaileddescription of a preferred embodiment given hereinafter by way ofnon-limiting example and with reference to the appended drawings. Inthese drawings:

FIG. 1 is a perspective view partially and schematically showing amanufacturing machine configured to manufacture an ophthalmic lens;

FIG. 2 is a perspective view schematically showing a system for themanufacturing of an ophthalmic lens, comprising a machining support unitfor surfacing and edging an ophthalmic substrate mounted on thissupport;

FIG. 3 is a sectional median view of the system shown in FIG. 2;

FIGS. 4 and 5 are exploded perspective views of the system shown on FIG.2, taken under two different view angles; and

FIG. 6 is a block diagram illustrating different operating steps of themethod of manufacturing of the ophthalmic lens.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

FIG. 1 shows a numerical-control “free-form” machine 1, numericalcontrol denoting the set of equipment and software, the function ofwhich is to give movement instructions to all the elements of themachine 1.

This machine 1 is configured for machining by turning (surfacing) anupper face 12 of an ophthalmic substrate 10 in order to form a secondface of an ophthalmic lens, including a surface of a progressive lensfurther having toric and/or prismatic components.

To this end, the machine 1 comprises a surfacing tool 8 and a controlunit 2 comprising a microprocessor 3 having a memory 4, in particular anon-volatile memory, allowing it to load and store software, in otherwords a computer program, which when it is executed in themicroprocessor 3, allows the implementation of a manufacturing methodaccording to the invention. This non-volatile memory 4 is for example ofthe ROM (“read only memory”) type.

The control unit 2 further comprises a memory 5, in particular avolatile memory, allowing data to be stored during the execution of thesoftware and the implementation of the method.

This volatile memory 5 is for example of the RAM or EEPROM type(respectively “random access memory” and “electrically erasableprogrammable read only memory”).

The machine 1 further comprises a glazed aperture 6 suitable forallowing the upper face 12 of the substrate 10 on which the machine 1 isoperating to be viewed.

This glazed aperture 6 makes it possible, during the implementation ofthe method, for a user of the machine 1 to monitor the satisfactoryprogress of the method by viewing the substrate 10 in the machine 1.

The machine 1 can also be configured for polishing the upper face 12 andfor edging a peripheral edge 13 of the ophthalmic substrate 10 in orderto form the ophthalmic lens.

To this end, the surfacing tool 8 has to be replaced by a polishing tooland/or an edging tool.

In variant, the polishing machine and/or the edging machine are (is)distinct from the surfacing machine and the polishing machine and/or theedging machine are (is) substantially similar to the surfacing machine,except that there is no surfacing tool but a polishing tool and/or anedging tool.

FIGS. 2 to 5 show a system 60 for the manufacturing of the ophthalmiclens from the ophthalmic substrate 10.

The system 60 comprises the ophthalmic substrate 10, a fastening (orfixation) member 20 and a machining support unit 65.

The ophthalmic substrate 10 comprises the upper face 12, a lower face 11opposite to the upper face 12 and the peripheral edge 13 linking thelower and upper faces 11 and 12.

The ophthalmic substrate 10 has here a diameter equal to about 70 mm.

The lower face 11 is configured to form a first face, also named frontface, of the ophthalmic lens.

The upper face 12 is configured to form (after surfacing) a second face,also named rear face, of the ophthalmic lens.

The second face is opposite to the first face.

The peripheral edge 13 is configured to form (after edging) a peripheraloutline of the ophthalmic lens, the peripheral outline linking the firstand second faces.

Here, the lower face 11 of the substrate 10 is convex. The lower face 11comprises optical properties (for instance simple for a single visionlens or complex for a progressive lens), and already forms the frontface of the ophthalmic lens. That is why the substrate 10 is here namedophthalmic substrate. Such ophthalmic substrate 10 can also be namedsemi-finished blank.

The fastening member is formed by an adhesive film 20 which has a firstadhesive face 21 and a second adhesive face 22 opposite to the firstadhesive face 21.

The first adhesive face 21 is configured to be fixed on the machiningsupport unit 65 and the second adhesive face 22 is configured to befixed on the lower face 11 of the ophthalmic substrate 10. The adhesivefilm 20 is deformable.

The machining support unit 65 is configured to receive the ophthalmicsubstrate 10 for surfacing the upper face 12 and further for edging theperipheral edge 13.

The machining support unit 65 comprises a surfacing member 40 and anedging member 30.

The edging member 30 is made from a plastic material moulded in a singlepiece.

The edging member is formed by a pin 30 which comprises a circularflange having a lower face 31, an upper face 32 opposite to the lowerface 31 and a peripheral outline 33 linking the lower and upper faces 31and 32.

The upper face 32 is configured to partially form a mounting face of themachining support unit 65.

This upper face 32 has a general curved-shape which matches at leastpartially with the shape of the lower face 11 of the ophthalmicsubstrate 10.

The pin 30 further comprises a block 34 which protrudes from the lowerface 31.

The block 34 comprises a lateral wall which extends from the lower face31.

The block 34 further comprises a beveled portion 38 at least partiallycircular and linked to the cylindrical lateral wall 35.

The block 34 further comprises a notch 37 diametrically formed in thecylindrical lateral wall 35.

The block 34 further comprises a bearing face 36 at a free end of theblock 34 (at the opposite of the lower face 31).

The pin 30 is configured to be accommodated in the surfacing member 40.

The pin 30 is further configured to be separable from this surfacingmember 40.

The surfacing member is formed by a ring 40 made from a plastic materialmoulded in a single piece.

The ring 40 comprises a body 41 having a generally cylindrical shape.

The body 41 comprises a cylindrical lateral wall 42 which defines aninternal lateral face 52 and a free edge 44.

The body 41 further comprises a tapered wall 43 linked to thecylindrical lateral wall 42 at the opposite of the free edge 44.

The body 41 further comprises a bottom wall 45 linked to the taperedwall 43 at the opposite of the cylindrical lateral wall 42.

The tapered wall 43 and the bottom wall 45 define an internal bottomface 53 of the ring 40.

The internal lateral face 52 and the internal bottom face 53 (the latterbeing tapered) define an internal space of a cavity 51 of the ring 40.

The internal lateral face 52 and the internal bottom face 53 furtherpartially form the mounting face of the machining support unit 65,together with the upper face 32 of the pin 30.

The internal bottom face 53 is configured to have a shape whichpartially matches with the shape of the lower face 11 of the ophthalmicsubstrate 10.

It should further be noted that the internal lateral face 52 isconfigured to have a shape which partially matches with the shape of theperipheral edge 13 of the ophthalmic substrate 10.

The body 41 further comprises a base 46 configured to be mounted on asurfacing machine and on an edging machine as shown in FIG. 1.

The base 46 comprises a lateral wall 47 linked to the bottom wall 45, atapered wall 46 linked to the lateral wall 47 and a bearing face 49 at afree end of the base 46, the free end being opposite to the bottom wall45.

The base 46 further comprises a slot 50 diametrically formed on thetapered wall 48.

The slot 50 forms two notches in the tapered wall 48 and a centrallyopening between these two notches.

The body 41 further comprises a recess formed in the internal bottomface 53, the recess forming a housing 62 configured to receive the pin30.

The housing 62 comprises a wall 55 linked to the internal bottom face53, a bottom 56 linked to the wall 55 at the opposite of the internalbottom face 53 and two grooves 57 formed in the bottom 56.

Each groove 57 has a bottom 59 and the two grooves 57 are separated fromeach other by a rib 58.

It should be noted that the housing 62 belongs to the cavity 51 whichdefines an internal space in which the pin 30 is configured to belocated.

We will now describe in detail the system 60 having the ophthalmicsubstrate 10, the adhesive film 20 and the machining support unit 65 (inother words the pin 30 together with the ring 40) which are assembled.

The pin 30 is accommodated in the housing 62 of the ring 40.

The lower face 31 of the pin 30 faces the bottom 56.

The block 34 is partially introduced in the grooves 57, the bearing face36 of the block 34 coming into abutment against the bottom 59 of thegrooves 57, and the rib 58 is received in the notch 37.

The pin 30 is thus mounted and positioned in a predetermined position inthe ring 40.

As mentioned above, the mounting face of the machining support unit 60is here formed by the internal bottom face 53 of the ring 40 and by theupper face 32 of the pin 30.

The adhesive film 20 is fixed by its first adhesive face 21 on the upperface 32 of the pin 30.

The adhesive film 20 has here a diameter which is slightly smaller thanthe diameter of the pin 30.

The ophthalmic substrate 10 is mounted on the mounting face of themachining support unit 65. The lower face 11 of the ophthalmic substrate10 faces the internal bottom face 53 of the ring 40 and further facesthe second adhesive face 22 of the adhesive film 20 together with theupper face 32 of the pin 30.

The adhesive film 20 is thus partially located on the mounting face andis sandwiched between the machining support unit 65 and the lower face11 of the ophthalmic substrate 10.

The peripheral edge 13 of the ophthalmic substrate 10 partially facesthe internal lateral face 52 of the ring 40.

The lower face 11 of the ophthalmic substrate 10 comes into abutmentagainst the second adhesive face 22 of the adhesive film 20.

Thus, the ophthalmic substrate 10 is mounted and fixed to the machiningsupport unit 65, thanks to the internal lateral face 52 and the internalbottom face 53 (for the positioning) and thanks to the upper face 32 ofthe pin 30 together with the second adhesive face 22 of the adhesivefilm 20 (for the fixing).

The internal lateral face 52, the internal bottom face 53 and thehousing 62 of the ring 40 together with the pin 30 are configured sothat the ophthalmic substrate 10 is mounted and blocked (fixed) on themachining support unit 65 in a first predetermined position for thesurfacing of the upper face 12 and for the edging of the peripheral edge13.

The first predetermined position is defined by an alignment of a firstreference point of the ophthalmic substrate 10 with a first geometricalcenter of the ring 40 and further by an alignment of a second referencepoint of the ophthalmic substrate 10 with a second geometrical center ofthe pin 30.

The first reference point is in the upper face 12 of the ophthalmicsubstrate 10 and corresponds to a rotation center of this ophthalmicsubstrate 10 relative to a first machining referential of the surfacingmachine; and the second reference point of the ophthalmic substrate 10corresponds to an optical center and/or a boxing center of thisophthalmic substrate 10 relative to a geometrical shape of theophthalmic lens to obtain and relative to a second machining referentialof the edging machine. The first machining referential and the secondmachining referential can be identical or distinct.

The machining support unit 65 is configured so that the ring 40 is ableto be removed from the machining support unit 65 by retaining theophthalmic substrate 10, the adhesive film 20 and the pin 30, after thesurfacing of the upper face 12, and for the edging of the peripheraledge 13.

We will now describe the method for manufacturing the ophthalmic lens inreference to FIG. 6, by using the system 60 described above.

The method comprises a step 100 of providing a semi-finished blank (SF1)here formed by the ophthalmic substrate 10.

The method further comprises a step 110 of providing a machining supportunit 65 for surfacing and edging the ophthalmic substrate 10. Themachining support unit 65 comprises a surfacing ring 40 and an edgingpin 30.

The method further comprises a step 120 of mounting the ophthalmicsubstrate 10 on the machining support unit 65 in the first predeterminedposition and blocking (or fixing) the ophthalmic substrate 10 on thismachining support unit 65, here by the intermediary of the adhesive film20.

In this first predetermined position, the lower face 11 of theophthalmic substrate 10 faces the mounting face (the upper face 32, theinternal lateral face 52 and the internal bottom face 53) of themachining support unit 65.

The method further comprises a step 130 of surfacing the upper face 12of the ophthalmic substrate 10 in order to obtain a surfaced ophthalmicsubstrate 10.

The method may further comprise a step 135 of polishing the upper face12 surfaced of the ophthalmic substrate 10 in order to obtain a polishedsurfaced ophthalmic substrate 10.

The method further comprises a step 140 of withdrawing the surfacingring 40 from the machining support unit 65 by retaining the ophthalmicsubstrate 10 together with the pin 30 (the adhesive film 20 beingsandwiched between the ophthalmic substrate 10 and the pin 30), in thefirst predetermined position of the ophthalmic substrate 10 relative tothe pin 30.

The method further comprises a step 150 of edging the peripheral edge 13of the ophthalmic substrate 10 in order to obtain the ophthalmic lens.

The method may further comprise a step of coating the upper face 12 ofthe ophthalmic substrate 10, for instance with an anti-reflectivecoating or a photochromic coating or a polarizing coating, to form forinstance a top-coat or a hard coat, between the steps of surfacing andedging or after these steps.

The method may further comprise a step of coating the lower face 11 ofthe ophthalmic substrate 10, for instance with an anti-reflectivecoating or a photochromic coating or a polarizing coating, to form forinstance a top-coat or a hard coat, after the steps of surfacing andedging.

The method further comprises a step 160 of unblocking the ophthalmiclens (or the ophthalmic substrate 10 surfaced and edged) from the pin 30and thus from the adhesive film 20.

The machining support unit 65 is thus reusable for another method ofmanufacturing of an ophthalmic lens.

This ophthalmic lens comprises the first face formed from the lower face11, the second face formed from the surfaced upper face 12 and theperipheral outline formed from the edged peripheral edge 13.

In variants that are not illustrated:

-   -   at least one of the surfacing and edging members is not made        from a plastic material but rather from metal;    -   the adhesive film may have a diameter at least equal or greater        than the diameter of the pin 30, for instance an adhesive film        which covers the internal bottom face 53;    -   the adhesive film may comprise two distinct parts, one of said        parts being for instance removable from the mounting face of the        machining support unit;    -   the pin is not made from a single piece but may comprise a        plurality of parts;    -   the fastening member is not formed by an adhesive film which is        deformable but rather by a member which is only partially        deformable or rigid, for instance a curable resin or a metal        sheet;    -   the surfacing member is not formed by a ring having a generally        cylindrical shape and thus does not comprise a cylindrical        lateral wall, but the surfacing member is formed by a plate;    -   the edging member comprises a block having further locking ribs        and the surfacing member comprises a housing having further        complementary locking ribs configured to cooperate with locking        ribs of the block;    -   the edging member is not formed by a pin having both a flange        and a block but only by a flange;    -   the edging member is greater than the pin shown in FIGS. 2 to 5,        and for instance, the edging member forms a major portion of the        mounting face;    -   the edging member does not comprise a block as described above        but rather a fastening device like a hook or a quarter turn        device, also named bayonet device; and/or    -   the shape of the mounting face does not match with the shape of        the lower face of the substrate and a resin is injected between        the mounting face and the lower face to wedge the substrate.

It should be more generally noted that the invention is not limited tothe described and represented examples.

The invention claimed is:
 1. A system for the manufacturing of anophthalmic lens having a first face, a second face opposite to saidfirst face and a peripheral outline linking said first and second faces,said system comprising: a substrate having a lower face, an upper faceopposite to said lower face and a peripheral edge linking said lower andupper faces; a machining support unit comprising a mounting faceconfigured to receive said substrate for surfacing of said upper face ofsaid substrate and further for edging of said peripheral edge of saidsubstrate; wherein said machining support unit comprises a surfacingmember and an edging member separable from said surfacing member, saidsurfacing member has a cavity defining an internal space in which saidedging member is configured to be located during said surfacing of saidupper face, said surfacing member and edging member are configured sothat said substrate is mounted and blocked on said machining supportunit in a first predetermined position for said surfacing of said upperface and for said edging of said peripheral edge, and said surfacingmember and edging member are further configured so that said surfacingmember is able to be withdrawn from said machining support unit byretaining said substrate on said edging member for said edging of saidperipheral edge.
 2. The system according to claim 1, wherein saidmounting face is formed by an internal face of said surfacing member andan upper face of said edging member.
 3. The system according to claim 2,wherein said internal face of said surfacing member and said upper faceof said edging member are configured to form a first shape which matcheswith a second shape of said lower face of said substrate.
 4. The systemaccording to claim 3, wherein said surfacing member is formed by a ringcomprising a body having a generally cylindrical shape, said body havingsaid cavity and comprising an internal lateral face and an internalbottom face formed in said cavity which defines said internal face. 5.The system according to claim 3, wherein said edging member is formed bya pin which is accommodated into said cavity of said surfacing member.6. The system according to claim 2, wherein said surfacing member isformed by a ring comprising a body having a generally cylindrical shape,said body having said cavity and comprising an internal lateral face andan internal bottom face formed in said cavity which defines saidinternal face.
 7. The system according to claim 6, wherein said bodyfurther comprises a recess formed in said internal bottom face, saidrecess forming a housing configured to receive said edging member. 8.The system according to claim 7, wherein said body further comprises abase configured to be mounted on a surfacing machine and on an edgingmachine.
 9. The system according to claim 7, wherein said edging memberis formed by a pin which is accommodated into said cavity of saidsurfacing member.
 10. The system according to claim 6, wherein said bodyfurther comprises a base configured to be mounted on a surfacing machineand on an edging machine.
 11. The system according to claim 10, whereinsaid edging member is formed by a pin which is accommodated into saidcavity of said surfacing member.
 12. The system according to claim 6,wherein said edging member is formed by a pin which is accommodated intosaid cavity of said surfacing member.
 13. The system according to claim2, wherein said edging member is formed by a pin which is accommodatedinto said cavity of said surfacing member.
 14. The system according toclaim 2, wherein it further comprises a fastening member located atleast partially on said mounting face and sandwiched between saidmachining support unit and said lower face of said substrate.
 15. Thesystem according to claim 1, wherein said edging member is formed by apin which is accommodated into said cavity of said surfacing member. 16.The system according to claim 1, wherein it further comprises afastening member located at least partially on said mounting face andsandwiched between said machining support unit and said lower face ofsaid substrate.
 17. The system according to claim 16, wherein saidfastening member has a diameter at least equal or greater than adiameter of an upper face of said edging member.
 18. The systemaccording to claim 16, wherein said fastening member is formed by anadhesive film.
 19. The system for the manufacturing of an ophthalmiclens having a first face, a second face opposite to said first face anda peripheral outline linking said first and second faces, said systemcomprising: a substrate having a lower face, an upper face opposite tosaid lower face and a peripheral edge linking said lower and upperfaces; a machining support unit with a surfacing member and an edgingmember separable from the surfacing member, the machining support unitbeing configured to receive the substrate, the machining support unitcomprising a surfacing member and an edging member separable from thesurfacing member, the surfacing member being formed by a ring made froma plastic material molded in a single piece and having a cavity definingan internal space, the ring comprising a body having a generallycylindrical shape and comprising: a cylindrical lateral wall whichdefines an internal lateral face; a free edge; a tapered wall linked tothe cylindrical lateral wall at the opposite of the free edge; a bottomwall linked to the tapered wall at the opposite of the cylindricallateral wall, the tapered wall and the bottom wall defining an internalbottom face of the ring, the internal bottom face and the internallateral face of the cylindrical lateral wall define the internal spaceof the cavity of the surfacing member and partially form the mountingface of the machining support unit, together with a face of the edgingmember; a base configured to be mounted on a surfacing machine and on anedging machine, the base comprising a lateral wall linked to the bottomwall, another tapered wall linked to the lateral wall and a bearing faceat a free end of the base, the free end being opposite to the bottomwall, and a recess formed in the internal bottom face, the recessforming a housing configured to receive the edging member, the housingbelonging to the cavity and the recess comprising a wall linked to theinternal bottom face, a bottom linked to the wall of the housing at theopposite of the internal bottom face, and grooves formed in the bottomof the housing; the substrate is configured to be mounted on themachining support unit and blocked with the machining support unit, thelower face of the substrate face a mounting face of the machiningsupport unit for surfacing the upper face of the substrate and theedging member is located in the internal space of the surfacing member;and the surfacing member is configured to be withdrawn from themachining by retaining the substrate on the edging member for edging theperipheral edge of the substrate.
 20. The system for the manufacturingof an ophthalmic lens having a first face, a second face opposite tosaid first face and a peripheral outline linking said first and secondfaces, said system comprising: a substrate having a lower face, an upperface opposite to said lower face and a peripheral edge linking saidlower and upper faces; a machining support unit with a surfacing memberhaving a cavity defining an internal space and an edging memberseparable from the surfacing member, the machining support unit beingconfigured to receive the substrate, the edging member being formed by apin comprising: a circular flange having a lower face, an upper faceopposite to the lower face, and a peripheral outline linking the lowerface of the circular flange and the upper face of the circular flange,the upper face having a generally curved-shape and that is configured topartially form the mounting face of the machining support unit; and ablock which protrudes from the lower face of the circular flange, theblock comprising: a cylindrical lateral wall which extends from thelower face of the circular flange; a beveled portion that is at leastpartially circular and is linked to the cylindrical lateral wall; anotch diametrically formed in the cylindrical lateral wall; and abearing face at a free end of the block which is opposite the lower faceof the circular flange; the pin is configured to be accommodated in thesurfacing member and to be separable from the surfacing member; thesurfacing member is formed by a ring comprising a body having agenerally cylindrical shape and a recess forming a housing configured toreceive the pin, the housing belongs to the cavity and the recesscomprises grooves separated by a rib, the block of the pin areconfigured to be partially introduced in the grooves of the ring, thebearing face of the block come into abutment against a bottom of thegrooves, the rib of the ring are received in the notch of the pin; thesubstrate is configured to be mounted on the machining support unit andblocked with the machining support unit, the lower face of the substrateface a mounting face of the machining support unit for surfacing theupper face of the substrate and the edging member is located in theinternal space of the surfacing member; and the surfacing member isconfigured to be withdrawn from the machining by retaining the substrateon the edging member for edging the peripheral edge of the substrate.